/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.camel.resume;

import java.nio.ByteBuffer;

/**
 * Generic offset without a concrete type
 *
 * @param <T> the type of the offset
 */
public interface Offset<T> extends Serializable {

    /**
     * Sets the current offset value
     *
     * @param offset the current offset value
     */
    void update(T offset);

    /**
     * Gets the offset value
     *
     * @return the offset value
     */
    T getValue();

    /**
     * Gets the offset value converting it to the given type
     *
     * @param  tClass type to convert the value to
     * @return        the offset value or null if it cannot be converted
     */
    default <V> V getValue(Class<V> tClass) {
        try {
            return tClass.cast(getValue());
        } catch (ClassCastException e) {
            return null;
        }
    }

    @Override
    default ByteBuffer serialize() {
        return serialize(getValue());
    }
}
